Hot-blast stove.



Patented oct. 14, |902. s. T. & c. H. wELLMAN.

HOT BLAST STDVE.

(Application filed Dec. 19, 1901.)

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(No Model.)

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ETERS C0., PNOYD-LITNO.. WASHINGTON D C Patented Oct. I4, |902.

s. T. & c. H.. wELLMAN.

l HOT4 BLAST STOVE.

(Application led Dec. 19, 1901.)

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IINrrED STATES' PATENTN OFFICE.

SAMUEL T. WELLMAN AND CHARLES H. WELLMAN, OF CLEVELAND, OHIO,

ASSIGNORS TO VELLMANSEAVER ENGINEERING COMPANY, OF CLEVE- LAND, OHIO, A CORPORATION OF OHIO.

HOT-BLAST STOVE.

SPECIFICATION forming' part of Letters Patent N 0. 711,089, dated October 14, 1902. Application filed December 19, 1901. Serial No. 86,587.` (No model.)

T all wiz/0m. it may concern:

Beit known that we, SAMUEL T. WELLMAN and CHARLES H. WELLMAN, citizens of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented or discovered new and useful Improvements in Hot-Blast Stoves, of which the following is a specification.

Figure I is a central vertical section of our to four-pass hot-blast stove. Fig. II is a crosssection on line II II of Fig. I. Fig. III is a crosssection on line III III of Fig. I. Fig. IV is a cross-section on line IV IV of Fig. I. Fig. V is a vertical section on line V V of I5 Fig. IV, showing the air-inlet.

Our invention relates to hot-blast stoves, but more particularly to that class technically known as four-pass stoves.

The object of our invention, generally zo stated, is to provide a central combustionchamber surrounded by three segmental passes or chambers separated by radial Walls, whereby We secure a more uniform expansion of the brickwork, a more equal distribution 2 5 of the heat, an easier accessibility to the different passes for the purpose of inserting or removing the checkers, and a more simple construction than has heretofore been used in this class of hot-blast stoves.

3o In the drawings accompanying this specif iication, A represents a four-pass stove consisting of a central combustion-chamber, a segment of which is carried to the top near the dolne-lining, the chamber being surrounded by annular Walls divided by radial walls, thus forming vertical flues. The brickwork is surrounded by a steel shell provided with a steel bottom and a steel dome. The casings for the hot-blast and chimney valves, as 4o well as the frames for the' air-openings, are riveted to the stove-shell, and the openings into the hot-blast-valve and chimney-valve casings are formed of arched brick. The airopenings also have an arch, as shown at 3 in Fig. V. The checker-work is supported on a circular Wall 4 at the bottom of the stove. On top of this Wall are placed radial girderbricks 5 5, which are tied into the outer Wall 6 and the wall 2 of combustion-chamber 1.

On top of the girder-bricks 5 5 is placed an- 5o other set of girder-bricks 7 7. Running across the girder-bricks 5 5 on topof the girderbricks 7 7 are laid the checkers 8 8. The fines are divided into three distinct groups or passes by radial walls Sl, k10, and 11, Walls 9 and 10 extending to the top of the stove and wall l1 stopping, preferably, at the top line of the checker-work 8, so as to have a passage from fines 16 to iiues 17. One of the radial walls which reach to the topof the 6o stove', in this case Wall 10, is -provided With an arched opening 15 at the bottom, thus connecting two of the passes at the bottom of the stove. A segment of the wall 2 of the combustion-chamber 1 is built to the top of 65 the stove, the remaining part terminating, preferably, at the top of the checkers 8, so as to permit passage from chamber 1 to the flue 12. For the furtherpurpose of cleaning, repairing, dac., doors B are placed around the 7o bottom and top of the stove, providing means of access to the different chambers.

The lues 12 are larger than flues 16, which are larger-than fines 17,"so that the gases from the combustion-chamber 1 passsucces- 75 sively through chambers or passes having progressively smaller flues. The gases part with a portion of their heat in the i'lues 12 and become somewhat contracted. In this condition they pass into the third pass, hav- 8o ing a greater number of smaller fines, with consequent diminution in actual air-space to suit the contracted mass of gases and with consequent increase of heat-absorbing surface. The gases, still further contracted and cooled, go through the fourth pass, with the same results that occurred during their travel through'flues 1b'. Thus the hot gases part with a greater portion of their heat than they would in traveling through groups of fines of 9o the same size. u

In the heating of the different chambers of the stove gas is admitted through the end of the hot-blast-valve casing at 13. -Air is admitted through the opening 14. (See Figs. .IV and V.) After combustion the waste gases pass up the combustion-chamber 1 to the top of the stove, then down through iiues 12 to the bottom of the stove, (see Fig. 11,) then through the arched opening 15 in the wall 10, (see Fig. V,) then up through the ues 16 to the top, passing over the wall 11 and down through theilues 17 to the bottom ofthe stove, then through the opening 18 and down to and through the chimney-flue, the valve 19 being open. During the operation the valve 2O and the openings 2l are closed. After the stove has been suiciently heated for the purpose yrequired the valve 19 and the openings 13 and 14 are closed and the valve 20 and the opening 21 are opened. Cold air is .then blown through the stove in reverse to the operation described above, and the hot air leaves the stove through an opening at 22. The burned gases while on their way to the chimney through the dierent passes impart a great heat to the brickwork of the stove, thus raising the temperature of the air to be heated to a higher degree and in a shorter time than in a stove of fewer passes.

The checker-work. of this stove is built up of ordinary straight brick laid in clay, so that there are no special bricks required except for the girders on the bottom and the arches around the openings.

Having described our invention, we claim- 1. Ina hot-blast stove, a central combustion-chamber or pass, and a plurality of segmental passes surrounding the central pass, all the passes connected to form a single continuous passage.

2. In a hot-blast stove, a tubular wall forming a central pass, a wall inclosing the tubular wall, and vertical transverse walls dividing the space between the two walls into a series of passes, all the passes connected to form a single continuous passage.

3. 1n a hot-blast stove, a combustion-chamber, and a series of passes provided with flues which ineach pass are progressively smaller in the direction of the travel of the gas from the combustion-chamber.

4. In a hot-blast stove, a central tubular Wall extending to the top thereof, and a wall inclosing the central wall, the space between the walls being divided by vertical walls into segmental passes, the central wall having a passage above and leading to an adjacent segmental pass, and two of the said vertical walls, having passages between adjacent forming a single continuous annular passage,

the central pass communicating at its top with a down-pass, the latter communicating at its bottom with an up-pass, and the latter communicating at its top with a down-pass leading to the chimney-flue.

Signed at Cleveland this 14th day of December, A. D. 1901.

SAMUEL T. WELLMAN. CHARLESH. WELLMAN.

Witnesses:

C. W. CoMsTocK, HERBERT P. GLIDDEN. 

